package com.example.demo.services.impl;

import com.example.demo.common.AppResult;
import com.example.demo.common.ResultCode;
import com.example.demo.dao.BoardMapper;
import com.example.demo.exception.ApplicationException;
import com.example.demo.model.Board;
import com.example.demo.services.IBoardService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;

/**
 * @Author baekhyun
 **/
@Slf4j
@Service
public class BoardServiceImpl implements IBoardService {

    @Resource
    private BoardMapper boardMapper;
    @Override
    public List<Board> selectByNum(Integer num) {
        //非空校验
        if (num==null){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调用Dao
        List<Board> boards=boardMapper.selectByNum(num);
        //返回结果
        return boards;
    }

    @Override
    public Board selectById(Long id) {
        //非空校验
        if (id==null || id<=0){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调用Dao
        Board board=boardMapper.selectByPrimaryKey(id);
        //返回结果
        return board;
    }

    @Override
    public void addOneArticleCountById(Long id) {
        //非空校验
        if (id==null || id<=0){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //获取用户信息
        Board board=selectById(id);
        if (board==null || board.getDeleteState()==1){
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //构建更新对象
        Board updateBoard=new Board();
        //用户Id
        updateBoard.setId(board.getId());
        //发帖数在原来的基础上+1
        updateBoard.setArticleCount(board.getArticleCount()+1);
        //更新时间
        updateBoard.setUpdateTime(new Date());

        //调用DAO
        int row=boardMapper.updateByPrimaryKeySelective(updateBoard);
        if (row!=1){
            //打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }

    @Override
    public void subOneArticleCountById(Long id) {
        //非空校验
        if (id==null || id<=0){
            //打印日志
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //查询版块详情
        Board board=boardMapper.selectByPrimaryKey(id);
        if (board==null){
            //打印日志
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString()+",board id="+id);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //构造更新对象
        Board updateBoard=new Board();
        updateBoard.setId(board.getId());
        updateBoard.setArticleCount(board.getArticleCount()-1);
        //判断减1之后是否小于0
        if (updateBoard.getArticleCount()<0){
            //如果小于0那么设置为0
            updateBoard.setArticleCount(0);
        }
        //调用DAO
        int row=boardMapper.updateByPrimaryKeySelective(updateBoard);
        if (row!=1){
            log.warn(ResultCode.FAILED.toString()+",受影响的行数不等于1.");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }
}
